Boiler-eubitace



unrrn sra ion.

EVAN SKELLY, OF PLAQUEMINE, LOUISIANA.

I BOILER-FURNACE.

Speccaton of Letters Patent No. 22,382, dated December 21, 1858.

To all whom it may concern:

Be it known that I, EVAN SKELLY, of Plaquemine, in the parish of Iberville and State of Louisiana, have invented a new and useful Improvement in Boiler-Furnaces; and I do hereby declare that the following is a full, clear, and exact description of the same, reference being had to the ac companying drawings, forming part of this specification, in which Figure l, is a central, longitudinal vertical section of a boiler-furnace constructed according to my invention. Fig. 2, is a horizontal section of the same furnace, in the plane indicated by the line a?, a', of Fig. l, the boilers being omitted. Figs. El and l.- arc transverse vertical sections taken respectively in the planes indicated by the lines y, y, and e, e, of Fig. 1, looking in the directionindicated by the arrows near those lines in Fig. l.

Similar letters of reference indicate corresponding parts in the several ligures.

To enable others to apply my invention, I will proceed to describe its construction and operation.

A, A, are the two cylinders of a double cylindrical boiler, arranged side by side and connected near their ends or at as many points as may be desirable.

B, is the setting of masonry.

C, is the lire-chamber.

D, is the grate; and E, the closed ashpit.

F, F, and Gr, G, are a series of tire bridges in the main flue H, which extends from the irebox to the rear of the boiler and communicates with the chimney and is of a width equal to the two cylinders A, A; the former F, F, being arranged singly in the center of .the flue I-I, and extending toward the sides beyond the centers of the cylinders A, A, and having an opening a, left at each end, Gr, G, being arranged to alternate with F, F, in pairs extending from the sides of the flue and toward the center thereof beyond the centers of the two cylinders A, A, and having openings Z), b, between them.

The above described arrangement of bridges is illustrated in Fig.2. The form of the tops of these bridges corresponds with the form of the bottoms of the boilers, but small spaces c, o, are leftbetween them and the boilers, as shown in Figs. l, 3, and 4, to prevent any heating surface being lost, as would be the case if said bridges were in contact with the boiler. The lateral contraction of the rear portion of the fire chamber and grate is illustrated in Fig. 2, where both are represented as tapering from the front all the way to the rear.

The side walls of the furnace are made with hollow spaces CZ, CZ, extending along the sides of the flue H. These spaces constitute air-chambers to which cold air is admitted by valves c, e, from the outside of the walls; and from the front ends of these chambers passages f, j', lead to the ashpit. The air admitted to the chambers (l, d, is heated therein, and supplied in a heated state by the passages f, f, to the ash pit, whence it passes through the grate to support combustion, and such air in its transit through the chamber and passages cools the walls of the furnace and prevents their cracking.

The operation of the furnace is as follows The flame and heated gaseous products of combustion escaping from the fire chamber into the flue H, under the boilers, the greater portion of them are caused by the arrangement of the bridges F, F, and

Gr, G, to have a tendency to escape in theA circuitous direction indicated by the black arrows in Fig. 2, through the passages a, a, l), l) but a small portion has a tendency to escape directly through the passages o, o, as indicated by the red arrows, and the different currents thus produced, meeting each other, cause a very perfect circulation under every part of the boiler, while the whole of the gaseous products of combustion pass steadily toward the rear end of the flue, whence they pass into the chimney.

By contracting.V the rear end of the tire chamber the products of combustion are condensed and thrown against the front bridge F with great vigor, and by it spread toward the sides of the smoke chamber and made to impinge against all the immediate portions of the boiler; and after passing the irst bridge the said products expand into a chamber larger than the contracted opening of the fire chamber, the effect of which expansion is to force the products into or under every exposed portion of the boiler, in the most thorough and efficacious manner.

I am aware that stoves have been made in which the lire chamber is fashioned in the form of a cone, the escape opening being contracted. I do not claim broadly, the

making of furnaces of conical shape. I do not claiin broadly, the idea of contracting the escape opening.

I do not claim the arrangement of bridge walls alternately on opposite sides of thel main Hue. But

What I claim as my invention, and desire tosecure by Letters Patent, is

H. J. PUQKET. 

